<template>
  <div class="notice">
    <div class="notice_left">
      <i class="el-icon-chat-line-round icon"></i>
      <span>公告</span>
    </div>
    <div
      class="notice_right"
      @mouseover="flag = false"
      @mouseleave="flag = true"
    >
      <el-carousel
        height="0.8rem"
        direction="vertical"
        :autoplay="false"
        indicator-position="none"
        :initial-index="0"
        ref="carousel"
      >
        <el-carousel-item v-for="(item, index) in gg" :key="index">
          <div class="medium">{{ item.noticeContent }}</div>
        </el-carousel-item>
      </el-carousel>
    </div>
    <!-- <div class="notice_more">
      <span>更多</span>
    </div> -->
  </div>
</template>

<script>
export default {
  name: "Home",
  data() {
    return {
      count: 0,
      left: 0,
      index: 0,
      frameNum: 0,
      flag: true,
      // gg: [],
      interval: null,
      timeOut: null,
      timeOut2: null,
      doms: null,
      inner: null,
    };
  },
  props: {
    gg: {
      type: Array,
      default: [],
    },
  },
  watch: {
    index: {
      handler(val1, val2) {
        if (this.flag) {
          // this.scroll();
        }
      },
      deep: true,
    },
    flag: {
      handler(val1, val2) {
        if (val1) {
          window.cancelAnimationFrame(this.frameNum);
          this.scroll();
        }
      },
      deep: true,
    },
    gg: {
      handler(val1, val2) {
        if (val1 && val1.length > 0) {
          this.scroll();
        }
      },
      immediate: true,
      deep: true,
    },
  },
  mounted() {
    window.addEventListener("resize", () => {
      window.cancelAnimationFrame(this.frameNum);
      this.scroll();
    });
  },
  methods: {
    setActiveItem(index) {
      if (this.$refs.carousel) {
        this.$refs.carousel.setActiveItem(index);
      }
    },
    setIndex() {
      if (this.index == this.gg.length - 1) {
        this.index = 0;
      } else {
        this.index += 1;
      }
    },
    setIntervalMth() {
      if (this.doms) {
        if (this.left >= this.count) {
          this.count += 1;
          this.inner[0].style.left = -this.count + "px";
          this.frameNum = window.requestAnimationFrame(this.setIntervalMth);
          // setTimeout(() => {
          // this.setIntervalMth()
          // },30)
        } else {
          this.count = 0;
          this.inner[0].style.left = "0px";
          clearTimeout(this.timeOut);
          window.cancelAnimationFrame(this.frameNum);
          if (this.flag) {
            this.setIndex();
            this.setActiveItem(this.index);
            this.scroll();
          } else {
            this.scroll();
          }
        }
      }
    },
    scroll() {
      this.count = 0;
      clearTimeout(this.timeOut);
      clearTimeout(this.timeOut2);
      this.$nextTick(() => {
        this.doms = document.getElementsByClassName("is-active");
        this.inner = this.doms[0].getElementsByClassName("medium");
        if (
          this.inner[0] &&
          this.doms[0] &&
          this.inner[0].scrollWidth > 0 &&
          this.doms[0].offsetWidth > 0
        ) {
          // 文字内容超出
          if (this.inner[0].scrollWidth > this.doms[0].offsetWidth) {
            this.left = this.inner[0].scrollWidth - this.doms[0].offsetWidth;
            this.timeOut = setTimeout(() => {
              this.count = 0;
              this.setIntervalMth();
            }, 2000);
          } else {
            // 文字内容未超出
            this.timeOut2 = setTimeout(() => {
              if (this.flag) {
                this.setIndex();
                this.setActiveItem(this.index);
                this.scroll();
              } else {
                this.setActiveItem(this.index);
              }
            }, 2000);
          }
        }
      });
    },
  },
};
</script>
<style lang="scss" scoped>
@function autoPx($num) {
  @return (($num / 1200) * 24rem);
}
.notice {
  display: flex;
  align-items: center;
  padding: 0 autoPx(10);
  .notice_left {
    display: flex;
    align-items: center;
    justify-content: center;
    width: autoPx(60);
    font-weight: 600;
    height: autoPx(40);
    line-height: autoPx(40);
    .icon {
      font-size: autoPx(15);
    }
    span {
      font-size: autoPx(15);
      margin-left: autoPx(5);
    }
  }
  .notice_right {
    height: autoPx(40);
    line-height: autoPx(40);
    width: calc(100% - (autoPx(60)));
    // width: calc(100% - (autoPx(110)));
    ::v-deep .medium {
      padding: 0 autoPx(10);
      font-size: autoPx(13);
      font-weight: 500;
      //text-align: left;
      height: autoPx(40);
      line-height: autoPx(40);
      width: 100%;
      position: absolute;
      // text-overflow: ellipsis; /*让截断的文字显示为点点。还有一个值是clip意截断不显示点点*/
      white-space: nowrap; /*让文字不换行*/
      // overflow: hidden; /*超出要隐藏*/
      // z-index: -1;
      // transition: all .5s;
    }
  }
  .notice_more {
    height: autoPx(40);
    line-height: autoPx(40);
    padding: 0 autoPx(8);
    font-size: autoPx(13);
    cursor: pointer;
  }
}
</style>
